A Court of Miracles, book 1: The Court of Miracles

In the violent urban jungle of an alternate 1828 Paris, the French Revolution has failed and the city is divided between merciless royalty and nine underworld criminal guilds, known as the Court of Miracles. Eponine (Nina) Thénardier is a talented cat burglar and member of the Thieves Guild. Nina's life is midnight robberies, avoiding her father's fists, and watching over her naïve adopted sister, Cosette (Ettie). When Ettie attracts the eye of the Tiger--the ruthless lord of the Guild of Flesh--Nina is caught in a desperate race to keep the younger girl safe. Her vow takes her from the city's dark underbelly to the glittering court of Louis XVII. And it also forces Nina to make a terrible choice--protect Ettie and set off a brutal war between the guilds, or forever lose her sister to the Tiger.